
Very easy to install and fairly well built. For the installation I had to buy a drill with a diameter of 22 mm. As for accuracy, it seems to be within a few percent. I will now go back and measure all mine and may update this post with more data. One of them reads 199-120 when my DMM reads 122.5. I think I trust the multimeter more because it pretty much matches the other multimeter I have. So the number could be about ±2%.

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